Splitting cells in a word table is an easy 8 step process that you can see below.
Following these steps, and any cell splitting you do will be finished quickly and correctly.

1. Select the cell you want to split.
2. Click the Layout tab..... Alt + J, L
3. Click the split cells button..... P
4. Click the Number of Columns to create a box..... Alt + C
5. Type number of columns.
6. Click Number of Rows To create a box..... Alt + R
7. Type a number of row's.
8. Click OK.... ENTER